﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;

namespace ZBZH_Manage_Order.PublicMethod
{
    public class md5jiami
    {
        public class MD5CryptoServiceProvider : MD5
        {
            public MD5CryptoServiceProvider()
                : base()
            {
            }
        }
        /// <summary>
        /// Summary description for MD5.
        /// </summary>
        public class MD5 : IDisposable
        {
            static public MD5 Create(string hashName)
            {
                if (hashName == "MD5")
                    return new MD5();
                else
                    throw new NotSupportedException();
            }

            static public String GetMd5String(String source)
            {
                MD5 md = MD5CryptoServiceProvider.Create();
                byte[] hash;

                //Create a new instance of ASCIIEncoding to 
                //convert the string into an array of Unicode bytes.
                UTF8Encoding enc = new UTF8Encoding();
                //            ASCIIEncoding enc = new ASCIIEncoding();

                //Convert the string into an array of bytes.
                byte[] buffer = enc.GetBytes(source);

                //Create the hash value from the array of bytes.
                hash = md.ComputeHash(buffer);

                StringBuilder sb = new StringBuilder();
                foreach (byte b in hash)
                    sb.Append(b.ToString("x2"));
                return sb.ToString();
            }

            static public MD5 Create()
            {
                return new MD5();
            }

            #region base implementation of the MD5
            #region constants
            private const byte S11 = 7;
            private const byte S12 = 12;
            private const byte S13 = 17;
            private const byte S14 = 22;
            private const byte S21 = 5;
            private const byte S22 = 9;
            private const byte S23 = 14;
            private const byte S24 = 20;
            private const byte S31 = 4;
            private const byte S32 = 11;
            private const byte S33 = 16;
            private const byte S34 = 23;
            private const byte S41 = 6;
            private const byte S42 = 10;
            private const byte S43 = 15;
            private const byte S44 = 21;
            static private byte[] PADDING = new byte[] {
              0x80, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
              0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
              0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
             };
            #endregion

            #region F, G, H and I are basic MD5 functions.
            static private uint F(uint x, uint y, uint z)
            {
                return (((x) & (y)) | ((~x) & (z)));
            }
            static private uint G(uint x, uint y, uint z)
            {
                return (((x) & (z)) | ((y) & (~z)));
            }
            static private uint H(uint x, uint y, uint z)
            {
                return ((x) ^ (y) ^ (z));
            }
            static private uint I(uint x, uint y, uint z)
            {
                return ((y) ^ ((x) | (~z)));
            }
            #endregion

            #region rotates x left n bits.
            /// <summary>
            /// rotates x left n bits.
            /// </summary>
            /// <param name="x"></param>
            /// <param name="n"></param>
            /// <returns></returns>
            static private uint ROTATE_LEFT(uint x, byte n)
            {
                return (((x) << (n)) | ((x) >> (32 - (n))));
            }
            #endregion

            #region FF, GG, HH, and II transformations
            /// FF, GG, HH, and II transformations 
            /// for rounds 1, 2, 3, and 4.
            /// Rotation is separate from addition to prevent recomputation.
            static private void FF(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
            {
                (a) += F((b), (c), (d)) + (x) + (uint)(ac);
                (a) = ROTATE_LEFT((a), (s));
                (a) += (b);
            }
            static private void GG(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
            {
                (a) += G((b), (c), (d)) + (x) + (uint)(ac);
                (a) = ROTATE_LEFT((a), (s));
                (a) += (b);
            }
            static private void HH(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
            {
                (a) += H((b), (c), (d)) + (x) + (uint)(ac);
                (a) = ROTATE_LEFT((a), (s));
                (a) += (b);
            }
            static private void II(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
            {
                (a) += I((b), (c), (d)) + (x) + (uint)(ac);
                (a) = ROTATE_LEFT((a), (s));
                (a) += (b);
            }
            #endregion

            #region context info
            /// <summary>
            /// state (ABCD)
            /// </summary>
            uint[] state = new uint[4];

            /// <summary>
            /// number of bits, modulo 2^64 (lsb first)
            /// </summary>
            uint[] count = new uint[2];

            /// <summary>
            /// input buffer
            /// </summary>
            byte[] buffer = new byte[64];
            #endregion

            internal MD5()
            {
                Initialize();
            }

            /// <summary>
            /// MD5 initialization. Begins an MD5 operation, writing a new context.
            /// </summary>
            /// <remarks>
            /// The RFC named it "MD5Init"
            /// </remarks>
            public virtual void Initialize()
            {
                count[0] = count[1] = 0;

                // Load magic initialization constants.
                state[0] = 0x67452301;
                state[1] = 0xefcdab89;
                state[2] = 0x98badcfe;
                state[3] = 0x10325476;
            }

            /// <summary>
            /// MD5 block update operation. Continues an MD5 message-digest
            /// operation, processing another message block, and updating the
            /// context.
            /// </summary>
            /// <param name="input"></param>
            /// <param name="offset"></param>
            /// <param name="count"></param>
            /// <remarks>The RFC Named it MD5Update</remarks>
            protected virtual void HashCore(byte[] input, int offset, int count)
            {
                int i;
                int index;
                int partLen;

                // Compute number of bytes mod 64
                index = (int)((this.count[0] >> 3) & 0x3F);

                // Update number of bits
                if ((this.count[0] += (uint)((uint)count << 3)) < ((uint)count << 3))
                    this.count[1]++;
                this.count[1] += ((uint)count >> 29);

                partLen = 64 - index;

                // Transform as many times as possible.
                if (count >= partLen)
                {
                    Buffer.BlockCopy(input, offset, this.buffer, index, partLen);
                    Transform(this.buffer, 0);

                    for (i = partLen; i + 63 < count; i += 64)
                        Transform(input, offset + i);

                    index = 0;
                }
                else
                    i = 0;

                // Buffer remaining input 
                Buffer.BlockCopy(input, offset + i, this.buffer, index, count - i);
            }

            /// <summary>
            /// MD5 finalization. Ends an MD5 message-digest operation, writing the
            /// the message digest and zeroizing the context.
            /// </summary>
            /// <returns>message digest</returns>
            /// <remarks>The RFC named it MD5Final</remarks>
            protected virtual byte[] HashFinal()
            {
                byte[] digest = new byte[16];
                byte[] bits = new byte[8];
                int index, padLen;

                // Save number of bits
                Encode(bits, 0, this.count, 0, 8);

                // Pad out to 56 mod 64.
                index = (int)((uint)(this.count[0] >> 3) & 0x3f);
                padLen = (index < 56) ? (56 - index) : (120 - index);
                HashCore(PADDING, 0, padLen);

                // Append length (before padding)
                HashCore(bits, 0, 8);

                // Store state in digest 
                Encode(digest, 0, state, 0, 16);

                // Zeroize sensitive information.
                count[0] = count[1] = 0;
                state[0] = 0;
                state[1] = 0;
                state[2] = 0;
                state[3] = 0;

                // initialize again, to be ready to use
                Initialize();

                return digest;
            }

            /// <summary>
            /// MD5 basic transformation. Transforms state based on 64 bytes block.
            /// </summary>
            /// <param name="block"></param>
            /// <param name="offset"></param>
            private void Transform(byte[] block, int offset)
            {
                uint a = state[0], b = state[1], c = state[2], d = state[3];
                uint[] x = new uint[16];
                Decode(x, 0, block, offset, 64);

                // Round 1
                FF(ref a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
                FF(ref d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
                FF(ref c, d, a, b, x[2], S13, 0x242070db); /* 3 */
                FF(ref b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
                FF(ref a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
                FF(ref d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
                FF(ref c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
                FF(ref b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
                FF(ref a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
                FF(ref d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
                FF(ref c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
                FF(ref b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
                FF(ref a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
                FF(ref d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
                FF(ref c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
                FF(ref b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

                // Round 2
                GG(ref a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
                GG(ref d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
                GG(ref c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
                GG(ref b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
                GG(ref a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
                GG(ref d, a, b, c, x[10], S22, 0x2441453); /* 22 */
                GG(ref c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
                GG(ref b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
                GG(ref a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
                GG(ref d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
                GG(ref c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
                GG(ref b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
                GG(ref a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
                GG(ref d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
                GG(ref c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
                GG(ref b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

                // Round 3
                HH(ref a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
                HH(ref d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
                HH(ref c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
                HH(ref b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
                HH(ref a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
                HH(ref d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
                HH(ref c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
                HH(ref b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
                HH(ref a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
                HH(ref d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
                HH(ref c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
                HH(ref b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
                HH(ref a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
                HH(ref d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
                HH(ref c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
                HH(ref b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */

                // Round 4
                II(ref a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
                II(ref d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
                II(ref c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
                II(ref b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
                II(ref a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
                II(ref d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
                II(ref c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
                II(ref b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
                II(ref a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
                II(ref d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
                II(ref c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
                II(ref b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
                II(ref a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
                II(ref d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
                II(ref c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
                II(ref b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */

                state[0] += a;
                state[1] += b;
                state[2] += c;
                state[3] += d;

                // Zeroize sensitive information.
                for (int i = 0; i < x.Length; i++)
                    x[i] = 0;
            }

            /// <summary>
            /// Encodes input (uint) into output (byte). Assumes len is
            ///  multiple of 4.
            /// </summary>
            /// <param name="output"></param>
            /// <param name="outputOffset"></param>
            /// <param name="input"></param>
            /// <param name="inputOffset"></param>
            /// <param name="count"></param>
            private static void Encode(byte[] output, int outputOffset, uint[] input, int inputOffset, int count)
            {
                int i, j;
                int end = outputOffset + count;
                for (i = inputOffset, j = outputOffset; j < end; i++, j += 4)
                {
                    output[j] = (byte)(input[i] & 0xff);
                    output[j + 1] = (byte)((input[i] >> 8) & 0xff);
                    output[j + 2] = (byte)((input[i] >> 16) & 0xff);
                    output[j + 3] = (byte)((input[i] >> 24) & 0xff);
                }
            }

            /// <summary>
            /// Decodes input (byte) into output (uint). Assumes len is
            /// a multiple of 4.
            /// </summary>
            /// <param name="output"></param>
            /// <param name="outputOffset"></param>
            /// <param name="input"></param>
            /// <param name="inputOffset"></param>
            /// <param name="count"></param>
            static private void Decode(uint[] output, int outputOffset, byte[] input, int inputOffset, int count)
            {
                int i, j;
                int end = inputOffset + count;
                for (i = outputOffset, j = inputOffset; j < end; i++, j += 4)
                    output[i] = ((uint)input[j]) | (((uint)input[j + 1]) << 8) | (((uint)input[j + 2]) << 16) | (((uint)input[j + 3]) <<
    24);
            }
            #endregion

            #region expose the same interface as the regular MD5 object

            protected byte[] HashValue;
            protected int State;
            public virtual bool CanReuseTransform
            {
                get
                {
                    return true;
                }
            }

            public virtual bool CanTransformMultipleBlocks
            {
                get
                {
                    return true;
                }
            }
            public virtual byte[] Hash
            {
                get
                {
                    if (this.State != 0)
                        throw new InvalidOperationException();
                    return (byte[])HashValue.Clone();
                }
            }
            public virtual int HashSize
            {
                get
                {
                    return HashSizeValue;
                }
            }
            protected int HashSizeValue = 128;

            public virtual int InputBlockSize
            {
                get
                {
                    return 1;
                }
            }
            public virtual int OutputBlockSize
            {
                get
                {
                    return 1;
                }
            }

            public void Clear()
            {
                Dispose(true);
            }

            public byte[] ComputeHash(byte[] buffer)
            {
                return ComputeHash(buffer, 0, buffer.Length);
            }
            public byte[] ComputeHash(byte[] buffer, int offset, int count)
            {
                Initialize();
                HashCore(buffer, offset, count);
                HashValue = HashFinal();
                return (byte[])HashValue.Clone();
            }

            public byte[] ComputeHash(Stream inputStream)
            {
                Initialize();
                int count = 0;
                byte[] buffer = new byte[4096];
                while (0 < (count = inputStream.Read(buffer, 0, 4096)))
                {
                    HashCore(buffer, 0, count);
                }
                HashValue = HashFinal();
                return (byte[])HashValue.Clone();
            }

            public int TransformBlock(
                byte[] inputBuffer,
                int inputOffset,
                int inputCount,
                byte[] outputBuffer,
                int outputOffset
                )
            {
                if (inputBuffer == null)
                {
                    throw new ArgumentNullException("inputBuffer");
                }
                if (inputOffset < 0)
                {
                    throw new ArgumentOutOfRangeException("inputOffset");
                }
                if ((inputCount < 0) || (inputCount > inputBuffer.Length))
                {
                    throw new ArgumentException("inputCount");
                }
                if ((inputBuffer.Length - inputCount) < inputOffset)
                {
                    throw new ArgumentOutOfRangeException("inputOffset");
                }
                if (this.State == 0)
                {
                    Initialize();
                    this.State = 1;
                }

                HashCore(inputBuffer, inputOffset, inputCount);
                if ((inputBuffer != outputBuffer) || (inputOffset != outputOffset))
                {
                    Buffer.BlockCopy(inputBuffer, inputOffset, outputBuffer, outputOffset, inputCount);
                }
                return inputCount;
            }
            public byte[] TransformFinalBlock(
                byte[] inputBuffer,
                int inputOffset,
                int inputCount
                )
            {
                if (inputBuffer == null)
                {
                    throw new ArgumentNullException("inputBuffer");
                }
                if (inputOffset < 0)
                {
                    throw new ArgumentOutOfRangeException("inputOffset");
                }
                if ((inputCount < 0) || (inputCount > inputBuffer.Length))
                {
                    throw new ArgumentException("inputCount");
                }
                if ((inputBuffer.Length - inputCount) < inputOffset)
                {
                    throw new ArgumentOutOfRangeException("inputOffset");
                }
                if (this.State == 0)
                {
                    Initialize();
                }
                HashCore(inputBuffer, inputOffset, inputCount);
                HashValue = HashFinal();
                byte[] buffer = new byte[inputCount];
                Buffer.BlockCopy(inputBuffer, inputOffset, buffer, 0, inputCount);
                this.State = 0;
                return buffer;
            }
            #endregion

            protected virtual void Dispose(bool disposing)
            {
                if (!disposing)
                    Initialize();
            }
            public void Dispose()
            {
                Dispose(true);
            }
        }
    }
}